摘要:
In an inner surface of a lower flange of the magnetic tape reel, 6 concave portions each shaped in nearly as isosceles triangle are made formed at even angle intervals of 60 degrees with their circumferential cross-section area being larger as approaching to a hub. When a magnetic tape is wound on the hub, air which exists between a tape-winding surface of the hub or the tape already wound and the tape to be wound further is guided to the concave portions, and an amount of wound-in air becomes less in the inner side and large in the outer periphery. Consequently, a pressure of winding the tape tight at the outer periphery does not reach the inner side, so that winding irregularities or deformation of the tape do not occur.
摘要:
An injection molding die includes a fixed half die and a movable half die which has a core surface and which is provided with ejector pins. The ejector pins are held with their extremities retracted from the core surface to form recesses corresponding to compression allowances. The ejector pins are advanced toward the cavity to compress the compression allowances after a molten resin has been injected into the injection molding die in a manner which fills the cavity and the recesses. The compression with the ejector pins renders the pressure distribution int he cavity uniform, so that a molding can be formed with a high degree of accuracy and so that the injection molding cycle time can be reduced.
摘要:
An optical element has a base material having a surface and a plurality of structures which are arranged on the surface of the base material at a fine pitch equal to or shorter than the wavelength of visible light and which each includes a convex or concave portion. The elastic modulus of the material forming the structures is 1 MPa or more and 1200 MPa or less, and the surface on which the structures are formed are hydrophilic.
摘要:
An optical element includes a base body having a surface; and a plurality of structures arranged with fine pitches equal to or less than a wavelength of visible light on the surface of the base body, wherein an elastic modulus of a material forming the structure is equal to or greater than 1 MPa and equal to or less than 1200 MPa, an aspect ratio of the structure is equal to or greater than 0.6 and equal to or less than 5, and a coefficient of kinetic friction of the surface of the base body on which the plurality of structures are formed is equal to or less than 0.85.
摘要:
A reflection plate allowing the prevention of the generation of stray light, a method of manufacturing the same, and a light-emitting device using such a reflection plate are provided. The reflection plate includes: a base having light transparency, and having a plurality of projections formed on a surface thereof; a reflecting mirror film arranged so as to be laid over a side surface of each of the projections in the base; and a light absorption layer arranged in a part or the whole of each of depressions on the surface of the base, the depressions being formed in spaces between the plurality of projections.
摘要:
A method for producing a transmissive screen which includes a lens sheet having a lens formed on one side and a light shielding layer formed on the other side, the light shielding layer having openings formed in regions at which light is condensed by the lens is provided. The method includes: forming the light shielding layer on the other side of the lens sheet; and forming the openings in the regions at which light is condensed by the lens by radiating laser light from the one side of the lens sheet. In the forming of the openings, a degree of beam collimation of the laser light to the lens sheet is adjusted after an energy density of the laser light is adjusted.
摘要:
A light-diffusing film and screen including same are provided. The light-diffusing film having anisotropy in the diffusion angle includes a translucent support, and a translucent resin layer having irregularities on the surface thereof and being provided on the translucent support. In the light-diffusing film, the maximal value of the loss tangent (tan δ) determined from a dynamic viscoelasticity of the light-diffusing film lies in a temperature range of 0° C. to 60° C.
摘要:
A light diffusing film, a screen that utilizes same, and a method of producing same are provided. The light diffusing film provides a high luminance uniform over an overall area with a simple configuration and provides a good visibility. Also a method of producing the light diffusing film as well as a screen in which the light diffusing film is used are disclosed. The light diffusing film includes a base film, and a light diffusing layer formed on a principal surface of the base film and having a group of micro lenses each having a convex or concave shape which has different curvatures from each other along cross sections in a transverse direction and a vertical direction of the principal surface of the base film. The micro lenses individually have optical axes which are inclined toward the position of an assumed viewer forwardly of the light diffusing film.
摘要:
A printed material includes a printed material body with a surface, and an optical element disposed on the surface of the printed material body. The optical element includes multiple structures formed at a pitch not longer than the wavelength of visible light. The structures have an aspect ratio of 0.6 or more and 5.0 or less.
摘要:
To provide a novel cyclic amine compound and a process for producing a polyurethane resin by using it. A 3-hydroxy-1,5-diazabicyclo[3.2.2]nonane represented by the following formula (1), and a process for producing a polyurethane resin by using a catalyst for producing a polyurethane resin, which contains the 3-hydroxy-1,5-diazabicyclo[3.2.2]nonane. When the compound represented by the formula (1) has optical isomers, diastereomers or geometric isomers, the compound includes both a mixture of any of them and an isolated isomer of any of them. [in the above formula (1), each of R1, R2, R3, R4, R5, R6, R7 and R8 which are independent of one another, is a hydrogen atom, a C1-4 alkyl group, a hydroxy group, a hydroxymethyl group or a C1-4 alkoxy group.]